On September 17, 1787, the final draft of the Constitution was signed by 39 delegates. The document was then sent to the states for ratification, and went into effect on June 21, 1788.

Celebrate Constitution Day with the Library of Congress and explore materials from across its collections.

Think you know about the Constitution?  Many people know that the first ten amendments constitute the Bill of Rights but do you know who serves as President if neither the President nor the Vice-President can serve? Test your Constitutional knowledge here with this quick 10 question quiz!

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